US6693740B2ExpiredUtilityPatentIndex 92

Dispersion managed discrete Raman amplifiers

Assignee: CORNING INCPriority: Aug 7, 2001Filed: Aug 7, 2002Granted: Feb 17, 2004

Est. expiryAug 7, 2021(expired)· nominal 20-yr term from priority

H04B 10/2916G02B 6/02G02B 6/02242G02B 6/02261G02B 6/02266G02B 6/0228G02B 6/29377H01S 3/06725H01S 3/06758H01S 3/302H04B 10/25253

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Abstract

An optical amplifier comprises: (i) an input port for providing optical signal to the amplifier; (ii) an output port for providing amplified optical signal out of the amplifier; (iii) at least two optical fibers, one optical fiber having positive dispersion D 1 of greater than 10 ps/nm/km in a 1550 nm to 1620 nm wavelength range, the other fiber having negative dispersion D 2 of less than −5 ps/nm/km in a 1550 nm to 1620 nm wavelength range, wherein the length of each of said optical fiber is chosen to provide the amplifier with a predetermined amount of dispersion.

Claims

exact text as granted — not AI-modified

What is claimed:

1. A discrete Raman amplifier comprising: (i) an input port providing optical signal to said amplifier; (ii) an output port providing amplified optical signal out of said amplifier; (iii) at least two optical fibers, one optical fiber having positive dispersion D 1 of greater than 10 ps/nm/km in a 1550 nm to 1620 nm wavelength range, and length of 5 m to 2.5 km, the other fiber having a negative dispersion D 2 of less than −5 ps/nm/km in a 1550 nm to 1620 nm wavelength range and length of 5 m to 2.5 km, wherein the length of each of said optical fiber is chosen to provide said amplifier with a predetermined amount of dispersion.

2. The discrete Raman amplifier according to claim 1 , wherein said predetermined amount of dispersion is substantially zero, such that the dispersion of the amplifier is less than 25 ps/nm over the signal wavelength range.

3. The discrete Raman amplifier according to claim 1 , wherein D 1 &gt;20 ps/nm/km.

4. The discrete Raman amplifier according to claim 1 , wherein D 2 &lt;−10 ps/nm/km.

5. The discrete Raman amplifier according to claim 4 , wherein D 2 &lt;−20 ps/nm/km.

6. The amplifier of claim 1 wherein said at least two optical fibers have opposite signs of dispersion slope.

7. The amplifier of claim 1 , wherein both of said optical fibers are situated in one amplifier stage.

8. The amplifier of claim 1 , wherein said at least two optical fibers are situated in different amplifier stages.

9. The amplifier of claim 1 , wherein the positive dispersion fiber is a photonic crystal fiber.

10. The amplifier of claim 1 , wherein said optical fiber with said positive dispersion is located closer to the input port of said amplifier than the optical fiber with the negative dispersion.

11. A Raman amplifier according to claim 1 , wherein said optical fiber with said negative dispersion fiber is located closer to the input port of said amplifier than the optical fiber with the positive dispersion.

12. The Raman amplifier according to claim 1 , wherein said optical fiber with said positive dispersion comprises photonic crystal fiber.

13. The Raman amplifier according to claim 1 wherein optical fibers have dispersion D, wherein D&gt;|10|ps/nm/km.

14. The Raman amplifier according to claim 10 , wherein said fibers have the absolute value of dispersion in the range of 10 to 100 ps/nm/km.

15. An optical amplifier comprising: (i) an input port for providing optical signal to said amplifier; (ii) an output port for providing amplified optical signal out of said amplifier; (iii) at least two optical fibers, one with a positive dispersion D 1 of greater than 10 ps/nm/km in a 1550 nm to 1620 nm wavelength range, one with a negative dispersion D 2 of less than −5 ps/nm/km in a 1550 nm to 1620 nm wavelength range, wherein the length of each of said optical fiber is chosen to provide said amplifier with a predetermined amount of dispersion.

16. The amplifier of claim 15 , wherein fiber with the positive dispersion is a photonic crystal fiber.

17. The discrete Raman amplifier according to claim 15 , wherein said predetermined amount of dispersion is substantially zero, such that the dispersion of the amplifier is less than 25 ps/nm over the signal wavelength range.

18. The discrete Raman amplifier according to claim 15 , wherein D 1 &gt;20 ps/nm/km.

19. The discrete Raman amplifier according to claim 15 , wherein D 2 &lt;−10 ps/nm/km.

20. The discrete Raman amplifier according to claim 19 , wherein D 2 &lt;−20 ps/nm/km.

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